Now showing items 21-39 of 39

  • Key Information Retrieval in Hyperspectral Imagery through Spatial-Spectral Data Fusion 

    Mianji, Fereidoun A.; Zhang, Ye; Babakhani, Asad (Společnost pro radioelektronické inženýrství, 2010-12)
    Hyperspectral (HS) imaging is measuring the radiance of materials within each pixel area at a large number of contiguous spectral wavelength bands. The key spatial information such as small targets and border lines are ...
  • LMS Based Adaptive Channel Estimation for LTE Uplink 

    Rana, Md Masud; Kim, Jinsang; Cho, Won-Kyung (Společnost pro radioelektronické inženýrství, 2010-12)
    In this paper, a variable step size based least mean squares (LMS) channel estimation (CE) algorithm is presented for a single carrier frequency division multiple access(SC-FDMA) system under the umbrella of the long term ...
  • Log-Polar Quantizer with the Embedded G.711 Codec 

    Dincic, Milan R.; Peric, Zoran H. (Společnost pro radioelektronické inženýrství, 2010-12)
    In this paper a new two-dimensional vector quantizer for memoryless Gaussian source, realized in polar coordinates, is proposed. The G.711 codec is embedded in our vector quantizer, and therefore our vector quantizer is ...
  • Modeling of the Secondary System's Generated Interference and Studying of its Impact on the Secondary System Design 

    Ruttik, Kalle; Koufos, Konstantinos; Jantti, Riku (Společnost pro radioelektronické inženýrství, 2010-12)
    In this paper we study how much capacity a cellular secondary system can achieve if the interference to the TV system is kept under control. The interference is modeled and controlled in a slow fading environment. The ...
  • Modeling of the Simultaneous Influence of the Thermal Noise and the Phase Noise in Space Communication Systems 

    Baran, Ondrej; Kasal, Miroslav (Společnost pro radioelektronické inženýrství, 2010-12)
    Our work deals with studies of a noise behavior in space communication systems. Two most important noise types the additive thermal noise and the multiplicative phase noise, respectively, are included. A simple model of ...
  • Modular Filter Structures Using Current Feedback Operational Amplifiers 

    Koukiou, Georgia; Psychalinos, Costas (Společnost pro radioelektronické inženýrství, 2010-12)
    The concept of the wave filtering is followed in the derivation of high-order filter topologies by employing Current Feedback Operational Amplifiers as active blocks. For this purpose, the wave equivalent of an appropriate ...
  • Modulation Schemes for Cognitive Radio in White Spaces 

    Kollar, Zsolt; Horvath, Peter (Společnost pro radioelektronické inženýrství, 2010-12)
    In this paper we give an overview and a comparison of the possible waveforms for white space applications. Four physical layer schemes for cognitive radio are selected for study: Orthogonal Frequency Division Multiplexing ...
  • New Squarer Circuits and a Current-Mode Full-Wave Rectifier Topology Suitable for Integration 

    Minaei, Shahram; Yuce, Erkan (Společnost pro radioelektronické inženýrství, 2010-12)
    In this paper, three squarer configurations and a current-mode (CM) full-wave rectifier circuit are suggested. The first and second squarer configurations respectively use two PMOS and two NMOS transistors while the third ...
  • A New Technique of Frequency Hopping with Collision Avoidance 

    Pust, Radim; Burda, Karel (Společnost pro radioelektronické inženýrství, 2010-12)
    This article proposes a new technique of frequency hopping with collision avoidance (FH/CA). Currently there are well-known systems of frequency hopping which adapt their behavior based on previously measured data (such ...
  • On the Effect of Channel Impairments on VANETs Performance 

    Baltzis, Konstantinos B. (Společnost pro radioelektronické inženýrství, 2010-12)
    The primary means of studying the performance of vehicular ad hoc networks (VANETs) are computer simulations. Nowadays, the development of analytical models and the use of hybrid simulations that combine analytical modeling ...
  • Optimization of the Gaussian Kernel Extended by Binary Morphology for Text Line Segmentation 

    Brodic, Darko; Milivojevic, Zoran (Společnost pro radioelektronické inženýrství, 2010-12)
    In this paper, an approach for text line segmentation by algorithm with the implementation of the Gaussian kernel is presented. As a result of algorithm, the growing area around text is exploited for text line segmentation. ...
  • Optimum Detection Location-Based Cooperative Spectrum Sensing in Cognitive Radio 

    Zhang, Hongtao; Wang, Xiaoxiang; Kuo, Geng-Sheng; Bohnert, Thomas Michael (Společnost pro radioelektronické inženýrství, 2010-12)
    Cognitive radio arises as a hot research issue in wireless communications recently, attributed to its capability of enhancing spectral efficiency and catering for the growing demand for bandwidth. As a good embodiment of ...
  • Performance Analysis of Multiradio Transmitter with Polar or Cartesian Architectures Associated with High Efficiency Switched-Mode Power Amplifiers (invited paper) 

    Baudoin, Genevieve; Villegas, Martine; Suarez, Martha; Diet, Antoine; Robert, Fabien (Společnost pro radioelektronické inženýrství, 2010-12)
    This paper deals with wireless multi-radio transmitter architectures operating in the frequency band of 800 MHz – 6 GHz. As a consequence of the constant evolution in the communication systems, mobile transmitters must be ...
  • Performance Bounds of DPSK and OOK for Low Elevation Optical LEO Downlinks 

    Henniger, Hennes; Ludwig, Alexandra; Horwath, Joachim (Společnost pro radioelektronické inženýrství, 2010-12)
    Optical wireless LEO downlinks are seen as an emerging solution to increase available bandwidth to multigigabits per second. One of the biggest challenges is the impact of the atmosphere on the optical signal. The atmosphere ...
  • Performance of Pilot Aided Channel Estimation Technique in 2D Spreading Based Systems 

    Blumenstein, Jiri; Fedra, Zbynek; Sebesta, Vladimir (Společnost pro radioelektronické inženýrství, 2010-12)
    It has recently been observed that the combination of the OFDM (Orthogonal Frequency Division Multiplex) and the CDMA (Code Division Multiple Access) can achieve notably lower BER (Bit Error Rate) performance in comparison ...
  • Sensing Task Allocation for Heterogeneous Channels in Cooperative Spectrum Sensing 

    Wu, Qihui; Han, Han; Wang, Jinlong; Zhao, Zhitao; Zhang, Ze (Společnost pro radioelektronické inženýrství, 2010-12)
    In the traditional centralized cooperative spectrum sensing, all secondary users sense the same channel. But, for a given channel, there exists detection performance diversity among all the users, due to the different ...
  • Sierpinski-Based Conical Monopole Antenna 

    Vsetula, Petr; Raida, Zbynek (Společnost pro radioelektronické inženýrství, 2010-12)
    Planar Sierpinski monopole exhibits a multi-band behavior, but its parameters in operation frequency bands are not optimal. By mapping the Sierpinski monopole on a conical surface, a symmetrical three-dimensional (3-D) ...
  • Simulation and Measurement of the Transmission Distortions of the Digital Television DVB-T/H Part 3: Transmission in Fading Channels 

    Polak, Ladislav; Kratochvil, Tomas (Společnost pro radioelektronické inženýrství, 2010-12)
    The paper deals with the third (and last) part of results of the Czech Science Foundation research project that was aimed into the simulation and measurement of the transmission distortions of the digital terrestrial ...
  • The Witch Navigator - A Low Cost GNSS Software Receiver for Advanced Processing Techniques 

    Jakubov, Ondrej; Kovar, Pavel; Kacmarik, Petr; Vejrazka, Frantisek (Společnost pro radioelektronické inženýrství, 2010-12)
    The developement of advanced GNSS signal processing algorithms such as multi-constellation, multi-frequency and multi-antenna navigation requires an easily reprogrammable software defined radio solution. Various receiver ...